Process of making peroxid of hydrogen.



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' citizen of the German Empire,

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solved ill an electrolyte at atmospheric 3 peroxid at the PGERMANY,assienon are THE rmm'oir 'HJENKEL & CIR, OF 'DUSSELDORF, GERIlllIANY.

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To all wlz am it may concern Be it known that I, FRANZ FISCHER, a andresiding at Charlottenburg, near Berlin, Germany Specification ofLetters latent. Application filed my 7, 1913. Serial No. 766,091.-

Pnocnss or MAKING :esnoxin or'nrnnoenn.

Patented Feb. 16, Mill-5..

example, when employing 1% sulfuric acid as the electrolyte I haveobtained yields amounting to 90% of the theoretical value, and in'thismanner have obtained 3% sohave invented a certain new and usefulImlutions of hydrogen peroxid. I can only proved Process of MakingPeroxid of-Hydrogen, of which the following is a speci- My inventionrelates to a making hydrogen peroxid. As is well known, oxygen which isdisprocess of pressure can be reduced to hydrogen cathode according tothe equation:-

O +2H=H,O,.

A For this purpose however only very weak.

electric currents have heretofore been employed, whereby only very weakhydrogen peroxid solutions have been obtained containing not more thanabout 0.1%. Such a solution cannot be technically utilized, and

evaporation would not pay. Now I have found that by carrying out the.electrolysis more percentum of hydrogen peroxid can be obtained in aform which is directly employable for technical purposes. For example, Ihave saturated the electrolyte at a pressure of 100 atmospheres withoxygen or oxygenous gases and have then carried out the electrolysisunder pressure. In this way I have proved that if the anode and cathodechambers are separated, and if e. g. amalgamated gold cathodes areemployed, even whenhigh current densities are employed, e. g. 5 amperesper sq. dcm., it is possible to work with. about 2 volts; this isbecause the saturation of the electrolyte containing oxygen underpressure diminishes the voltage of decomposition. It is electrolyteemployed. When less value isattached to the purity of the hydrogenperoxid obtained than to a large yield for the energy expended, it ispreferable to employ stabilizing admixtures, as e. g. boric acid andurea which, as is well known, are

able to retard catalytic decomposition of the hydrogen peroxid.

I claim 1.. A process of making hydrogen peroxid which .consists inreducing gaseous oxygen to hydrogen peroxid by continuously forcingoxygen or oxygenous gases into the watery solution of a suitableelectrolyte under high pressure and during the simultaneous generationof hydrogen in the electrolyte by electrolysis.

.2. A process of preparing hydrogen peroxid which consists in reducinggaseous oxygen to hydrogen peroxid by. continuously forcing anddistributing oxygen or oxygenous gases into the watery solution of asuitable electrolyte under pressure and during simultaneous generationof hydrogen in the electrolyte by electrolysis.

3. A process of preparing hydrogen peroxid which consists in reducinggaseous oxygen to hydrogen peroxid by continuously forcing anddistributing oxygen or oxygenous gases into the watery acid solution ofa suitable electrolyte under high pressure and during simultaneousgenera tion ofhydrogen in the electrolyte by electrolysis. i

4:. A process of preparing hydrogen peroxid which consists in reducinggaseous oxygen to hydrogen peroxid by continuously forcing oxygen oroxygenous gas into the watery solution of a suitable electrolyte underhigh pressure and during simultaneous generation of hydrogen 1n theelectrolyte by electrolysis, adding a stabilizing ad- 2 1,1ee,eee

consisting in impregnating under a. pressure greater than atmospherictheaqueous solution'of an electrolyte with oxygen or oxygenous gases, inreducing the dlSSOlVBd oxygen to hydrogen peroxid at the cathode byelectrolysis under a ressure reater than atmospheric, and in ad ing asta lh zmg admixture tothe electrolyte. y H v 6. A process of makinghydro'en peroxid- ,consist ing in impregnatmg uner a pressure greaterthan atmospheric the aqueous acid solution'of an'electrolytewithoxygen Ior oxygenous gases, in redacing the dissolved oxygen to hydrogen.peroxid at a cathode but little attacked by weak acids-15 byelectrolysis under a pressure greater than atmospheric, and in adding astabiliz-- ing admixture to the electrolyte.

In testimony whereof, I aflix my signa ture in the presence of twowitnesses.

PROF. 'Dn. FRANZ FISCHER. Witnesses:

WOLDEMAR HAUPT, HENRY HASPER.

